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xtrx.c
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/*
* xtrx - kernel driver support for XTRX PCIe
*
* Copyright (C) 2014, 2016, 2017 Sergey Kostanbaev <[email protected]>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307,
* USA.
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/errno.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/kdev_t.h>
#include <linux/fs.h>
#include <linux/cdev.h>
#include <linux/sched.h>
#include <linux/poll.h>
#include <linux/mm.h>
#include <linux/tty.h>
#include <linux/tty_flip.h>
#include <linux/serial.h>
#include <linux/serial_core.h>
#include <linux/serial_reg.h>
#include <linux/kfifo.h>
#include <linux/device.h>
#include <linux/time.h>
#include <linux/pps_kernel.h>
#include <linux/version.h>
#include <linux/slab.h>
#include <asm/page.h>
#include <asm/io.h>
#include <asm/uaccess.h>
#include <asm/atomic.h>
#include "xtrx_defs.h"
#define localparam static const uint32_t
#include "xtrxll_regs.vh"
#define MAX_XTRX_DEVS 64
#define DRV_NAME "xtrx"
#define PFX DRV_NAME ": "
#define DEVICE_NAME DRV_NAME
#define CLASS_NAME DRV_NAME
#define XTRX_UART_LINE_GPS 0
#define XTRX_UART_LINE_SIM 1
#ifndef PCI_EXP_DEVCTL_READRQ_4096B
#define PCI_EXP_DEVCTL_READRQ_4096B 0x5000
#endif
/* Move out to extrnal CMD */
#define GET_HWID_COMPAT(x) ((x >> 8) & 0xff)
#define MAKE_I2C_CMD(RD, RDZSZ, WRSZ, DEVNO, DATA) (\
(((RD) & 1U) << 31) | \
(((RDZSZ) & 7U) << 28) | \
(((WRSZ) & 3U) << 26) | \
(((DEVNO) & 3U) << 24) | \
(((DATA) & 0xffffffu) << 0))
#define MAKE_LP8758XX_I2C_CMD(BUS, REG, IN) \
MAKE_I2C_CMD(0, 0, 2, (BUS), (REG) | ((u32)(IN) << 8))
#define MAKE_LP8758LMS_I2C_CMD(REG, IN) \
MAKE_LP8758XX_I2C_CMD(3, REG, IN)
/* Serial virtual devices */
struct xtrx_dev;
enum xtrx_uart_types {
XTRX_UART_GPS, /**< UART device for GPS NMEA */
XTRX_UART_SIM, /**< UART device for T0 smartcard */
XTRX_UART_NUM,
};
#define BUFS 32
#define BUF_SIZE 32768
#define BUF_SIZE_MIN 8192
#define BUF_SIZE_MAX 4194304
#define UART_PORT_OPEN 1
struct xtrx_dmabuf_nfo {
void* virt;
dma_addr_t phys;
};
typedef enum xtrx_interrupt_type {
XTRX_MSI_4,
XTRX_MSI_SINGLE,
XTRX_LEGACY
} xtrx_interrupt_type_t;
enum xtrx_pwr_blocks {
XTRX_BLK_CHAR_DEV = 1,
XTRX_BLK_GPS_UART = 2,
XTRX_BLK_SIM_UART = 4,
};
struct xtrx_dev {
struct xtrx_dev *next; /* next device in list */
unsigned devno;
unsigned locked_msk;
unsigned valid; /* usage counter */
spinlock_t slock;
struct cdev cdev;
struct device* cdevice;
xtrx_interrupt_type_t inttype;
wait_queue_head_t queue_ctrl; /* wait queue ctrl */
wait_queue_head_t queue_i2c; /* wait queue i2c */
wait_queue_head_t queue_tx; /* wait queue tx */
wait_queue_head_t queue_rx; /* wait queue rx */
wait_queue_head_t onepps_ctrl;
struct pci_dev *pdev; /* pci device */
struct pps_device *pps; /* 1PPS events from GPS */
void __iomem *bar0_addr;
void __iomem *bar1_addr;
void *shared_mmap;
unsigned buf_rx_size; /* actual size of each buffer in the RX ring */
unsigned buf_tx_size; /* actual size of each buffer in the TX ring */
struct xtrx_dmabuf_nfo buf_rx[BUFS]; /* RX bufs */
struct xtrx_dmabuf_nfo buf_tx[BUFS]; /* TX bufs */
struct uart_port port_gps;
struct uart_port port_sim;
unsigned gps_ctrl_state;
unsigned sim_ctrl_state;
u32 hwid;
u32 pwr_msk;
};
static struct xtrx_dev *xtrx_list = NULL;
static int devices = 0;
static dev_t dev_first; /* Global variable for the first device number */
static struct class* xtrx_class = NULL;
MODULE_AUTHOR("Sergey Kostanbaev <[email protected]>");
MODULE_DESCRIPTION("XTRX low-level PCIe driver");
MODULE_LICENSE("GPL");
MODULE_VERSION("0.1");
/* Some ARM platform pci_alloc_consistent() reports VA that can't be
* mmaped to userspce. Convertion DMA->PA->VA does the trick on that
* platforms
*/
#if defined(__arm__) || defined(__aarch64__)
#define VA_DMA_ADDR_FIXUP
#endif
static void xtrx_writel(struct xtrx_dev *dev, unsigned int off, unsigned int value)
{
iowrite32(cpu_to_be32(value), (void __iomem *)((unsigned long)dev->bar0_addr + 4*off));
}
static unsigned int xtrx_readl(struct xtrx_dev *dev, unsigned int off)
{
return be32_to_cpu(ioread32((void __iomem *)((unsigned long)dev->bar0_addr + 4*off)));
}
static int xtrx_power_op(struct xtrx_dev *dev, int on, unsigned mask)
{
unsigned long flags;
int do_pwr_op = 0;
spin_lock_irqsave(&dev->slock, flags);
if (on) {
if (dev->pwr_msk == 0) {
do_pwr_op = 1;
}
dev->pwr_msk |= mask;
} else {
if (dev->pwr_msk) {
dev->pwr_msk &= ~mask;
if (dev->pwr_msk == 0) {
do_pwr_op = 1;
}
}
}
spin_unlock_irqrestore(&dev->slock, flags);
if (!do_pwr_op)
return 0;
printk(KERN_NOTICE PFX " 3V3 CTRL:%d\n", on);
if (on) {
xtrx_writel(dev, UL_GP_ADDR + GP_PORT_WR_TMP102,
MAKE_LP8758LMS_I2C_CMD(0x0c, 0xfc));
xtrx_writel(dev, UL_GP_ADDR + GP_PORT_WR_TMP102,
MAKE_LP8758LMS_I2C_CMD(0x04, 0x88));
} else {
xtrx_writel(dev, UL_GP_ADDR + GP_PORT_WR_TMP102,
MAKE_LP8758LMS_I2C_CMD(0x04, 0xc8));
}
return 1;
}
#define PORT_XTRX 0x03300330
/*
* serial core request to check if uart tx fifo is empty
*/
static unsigned int xtrx_uart_tx_empty(struct uart_port *port)
{
// TODO
//printk(KERN_NOTICE PFX "Start TX empty?: %d\n", port->line);
return TIOCSER_TEMT;
}
static struct xtrx_dev *xtrx_dev_from_uart_port(struct uart_port *port)
{
if (port->line % XTRX_UART_NUM == XTRX_UART_LINE_SIM) {
return (struct xtrx_dev *)((unsigned long)port - offsetof(struct xtrx_dev, port_sim));
} else if (port->line % XTRX_UART_NUM == XTRX_UART_LINE_GPS) {
return (struct xtrx_dev *)((unsigned long)port - offsetof(struct xtrx_dev, port_gps));
} else {
return NULL;
}
}
static void xtrx_uart_set_mctrl(struct uart_port *port, unsigned int mctrl)
{
struct xtrx_dev *dev;
if (port->line % XTRX_UART_NUM == XTRX_UART_LINE_SIM) {
dev = xtrx_dev_from_uart_port(port);
if (!(mctrl & TIOCM_RTS)) {
dev->sim_ctrl_state |= WR_SIM_CTRL_RESET;
} else {
dev->sim_ctrl_state &= ~WR_SIM_CTRL_RESET;
}
xtrx_writel(dev, GP_PORT_WR_SIM_CTRL, dev->sim_ctrl_state);
printk(KERN_NOTICE PFX "SIM mctrl=%x\n", dev->sim_ctrl_state);
}
}
static unsigned int xtrx_uart_get_mctrl(struct uart_port *port)
{
return TIOCM_CTS;
}
static void xtrx_uart_stop_tx(struct uart_port *port)
{
// TODO
}
static void xtrx_uart_start_tx(struct uart_port *port)
{
// TODO
//printk(KERN_NOTICE PFX "Start TX: %d\n", port->line);
}
static void xtrx_uart_stop_rx(struct uart_port *port)
{
// TODO
}
static void xtrx_uart_enable_ms(struct uart_port *port)
{
}
static void xtrx_uart_break_ctl(struct uart_port *port, int ctl)
{
}
static void xtrx_uart_do_rx(struct uart_port *port, unsigned* fifo_used);
static int xtrx_uart_startup(struct uart_port *port)
{
unsigned long flags;
struct xtrx_dev *dev = xtrx_dev_from_uart_port(port);
if (port->line % XTRX_UART_NUM == XTRX_UART_LINE_SIM) {
spin_lock_irqsave(&port->lock, flags);
if (dev->sim_ctrl_state & WR_SIM_CTRL_ENABLE) {
spin_unlock_irqrestore(&port->lock, flags);
printk(KERN_NOTICE PFX "Port %d is already claimed!\n", port->line);
return -EBUSY;
}
dev->sim_ctrl_state = WR_SIM_CTRL_ENABLE;
xtrx_writel(dev, GP_PORT_WR_SIM_CTRL, dev->sim_ctrl_state);
spin_unlock_irqrestore(&port->lock, flags);
xtrx_power_op(dev, 1, XTRX_BLK_SIM_UART);
} else {
dev->gps_ctrl_state = UART_PORT_OPEN;
spin_lock(&dev->port_gps.lock);
if (dev->gps_ctrl_state) {
unsigned tx_fifo_used;
xtrx_uart_do_rx(&dev->port_gps, &tx_fifo_used);
//xtrx_uart_do_tx(&dev->port_gps, tx_fifo_used);
}
spin_unlock(&dev->port_gps.lock);
xtrx_power_op(dev, 1, XTRX_BLK_GPS_UART);
}
printk(KERN_NOTICE PFX "Port opened: %d\n", port->line);
return 0;
}
static void xtrx_uart_shutdown(struct uart_port *port)
{
unsigned long flags;
struct xtrx_dev *dev = xtrx_dev_from_uart_port(port);
if (port->line % XTRX_UART_NUM == XTRX_UART_LINE_SIM) {
spin_lock_irqsave(&port->lock, flags);
dev->sim_ctrl_state = 0;
xtrx_writel(dev, GP_PORT_WR_SIM_CTRL, dev->sim_ctrl_state);
spin_unlock_irqrestore(&port->lock, flags);
xtrx_power_op(dev, 0, XTRX_BLK_SIM_UART);
} else {
dev->gps_ctrl_state = 0;
xtrx_power_op(dev, 0, XTRX_BLK_GPS_UART);
}
printk(KERN_NOTICE PFX "Port closed: %d\n", port->line);
}
static void xtrx_uart_set_termios(struct uart_port *port,
struct ktermios *new,
#if LINUX_VERSION_CODE < KERNEL_VERSION(6, 1, 0)
struct ktermios *old
#else
const struct ktermios *old
#endif
)
{
unsigned long flags;
spin_lock_irqsave(&port->lock, flags);
// TODO: Set HW registers
spin_unlock_irqrestore(&port->lock, flags);
}
static const char *xtrx_uart_type(struct uart_port *port)
{
return (port->type == PORT_XTRX) ? "xtrx_uart" : NULL;
}
static int xtrx_uart_request_port(struct uart_port *port)
{
printk(KERN_NOTICE PFX "Port request: %d\n", port->line);
return 0;
}
static void xtrx_uart_release_port(struct uart_port *port)
{
printk(KERN_NOTICE PFX "Port release: %d\n", port->line);
}
static void xtrx_uart_config_port(struct uart_port *port, int flags)
{
printk(KERN_NOTICE PFX "Port config: %d (%x)\n", port->line, flags);
if (flags & UART_CONFIG_TYPE) {
if (xtrx_uart_request_port(port))
return;
port->type = PORT_XTRX;
}
}
static int xtrx_uart_verify_port(struct uart_port *port,
struct serial_struct *serinfo)
{
if (port->type != PORT_XTRX)
return -EINVAL;
return 0;
}
void xtrx_uart_do_rx(struct uart_port *port, unsigned* fifo_used)
{
struct tty_port *tty_port = &port->state->port;
struct xtrx_dev *dev = xtrx_dev_from_uart_port(port);
unsigned int max_count;
char flag;
int processed = 0;
max_count = 33;
do {
unsigned int c;
c = xtrx_readl(dev, (port->line % XTRX_UART_NUM == XTRX_UART_LINE_GPS) ?
GP_PORT_RD_UART_RX : GP_PORT_RD_SIM_RX);
if (fifo_used)
*fifo_used = ((c >> UART_FIFOTX_USED_OFF) & ((1 << UART_FIFOTX_USED_BITS) - 1)) + ((c & (1 << UART_FIFOTX_EMPTY)) ? 0 : 1);
if (c & (1 << UART_FIFORX_EMPTY))
break;
//printk(KERN_NOTICE PFX "Char %d: %x\n", port->line, c);
port->icount.rx++;
flag = TTY_NORMAL;
c &= 0xff;
tty_insert_flip_char(tty_port, c, flag);
processed = 1;
} while (--max_count);
if (processed) {
spin_unlock(&port->lock);
tty_flip_buffer_push(tty_port);
spin_lock(&port->lock);
}
}
static void xtrx_uart_do_tx(struct uart_port *port, unsigned fifo_used)
{
#if LINUX_VERSION_CODE < KERNEL_VERSION(6, 10, 0)
struct circ_buf *xmit;
#else
struct tty_port *tport;
#endif
unsigned int max_count;
struct xtrx_dev *dev = xtrx_dev_from_uart_port(port);
if (port->x_char) {
xtrx_writel(dev, (port->line % XTRX_UART_NUM == XTRX_UART_LINE_GPS) ?
GP_PORT_WR_UART_TX : GP_PORT_WR_SIM_TX,
port->x_char);
port->icount.tx++;
port->x_char = 0;
return;
}
if (uart_tx_stopped(port)) {
xtrx_uart_stop_tx(port);
return;
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(6, 10, 0)
xmit = &port->state->xmit;
if (uart_circ_empty(xmit))
goto txq_empty;
#else
tport = &port->state->port;
if (kfifo_is_empty(&tport->xmit_fifo))
goto txq_empty;
#endif
max_count = port->fifosize - fifo_used;
while (max_count--) {
#if LINUX_VERSION_CODE < KERNEL_VERSION(6, 10, 0)
unsigned int c;
c = xmit->buf[xmit->tail] & 0xff;
//printk(KERN_NOTICE PFX "Char: %x\n", c);
#else
unsigned char c;
if (kfifo_is_empty(&tport->xmit_fifo) || kfifo_get(&tport->xmit_fifo, &c) == 0)
break;
#endif
xtrx_writel(dev, (port->line % XTRX_UART_NUM == XTRX_UART_LINE_GPS) ?
GP_PORT_WR_UART_TX : GP_PORT_WR_SIM_TX, c);
#if LINUX_VERSION_CODE < KERNEL_VERSION(6, 10, 0)
xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
port->icount.tx++;
if (uart_circ_empty(xmit))
break;
#endif
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(6, 10, 0)
if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
uart_write_wakeup(port);
if (uart_circ_empty(xmit))
goto txq_empty;
#else
if (kfifo_len(&tport->xmit_fifo) < WAKEUP_CHARS)
uart_write_wakeup(port);
if (kfifo_is_empty(&tport->xmit_fifo))
goto txq_empty;
#endif
return;
txq_empty:
/* nothing to send, disable transmit interrupt */
// TODO
return;
}
/*
static int xtrx_uart_verify_ioctl(struct uart_port *port, unsigned int cmd, unsigned long arg)
{
printk(KERN_NOTICE PFX "UART IOCTL %d: %08x -> %016lx\n",
port->line, cmd, arg);
return -EINVAL;
}
*/
static struct uart_ops xtrx_uart_ops = {
.tx_empty = xtrx_uart_tx_empty,
.get_mctrl = xtrx_uart_get_mctrl,
.set_mctrl = xtrx_uart_set_mctrl,
.start_tx = xtrx_uart_start_tx,
.stop_tx = xtrx_uart_stop_tx,
.stop_rx = xtrx_uart_stop_rx,
.enable_ms = xtrx_uart_enable_ms,
.break_ctl = xtrx_uart_break_ctl,
.startup = xtrx_uart_startup,
.shutdown = xtrx_uart_shutdown,
.set_termios = xtrx_uart_set_termios,
.type = xtrx_uart_type,
.release_port = xtrx_uart_release_port,
.request_port = xtrx_uart_request_port,
.config_port = xtrx_uart_config_port,
.verify_port = xtrx_uart_verify_port,
//.ioctl = xtrx_uart_verify_ioctl,
};
static struct uart_driver xtrx_uart_driver = {
.owner = THIS_MODULE,
.driver_name = "xtrxuart",
.dev_name = "ttyXTRX",
.nr = XTRX_UART_NUM * MAX_XTRX_DEVS,
.cons = NULL,
};
// TTY functions
static int xtrx_uart_init(struct xtrx_dev* dev, unsigned xtrx_no)
{
int ret;
// Register GPS port
dev->port_gps.membase = (void __iomem *)((unsigned long)dev->bar0_addr + GP_PORT_RD_UART_RX*4);
dev->port_gps.iotype = UPIO_MEM;
//dev->port_gps.irq = -1;
dev->port_gps.ops = &xtrx_uart_ops;
dev->port_gps.flags = UPF_BOOT_AUTOCONF;
dev->port_gps.dev = &dev->pdev->dev;
dev->port_gps.fifosize = 32;
dev->port_gps.uartclk = 9600*16;
dev->port_gps.line = xtrx_no * XTRX_UART_NUM + XTRX_UART_LINE_GPS;
ret = uart_add_one_port(&xtrx_uart_driver, &dev->port_gps);
if (ret) {
printk(KERN_NOTICE PFX "Unable to initialize UART GPS port: %d\n", ret);
return ret;
}
// Register SIM port
dev->port_sim.membase = (void __iomem *)((unsigned long)dev->bar0_addr + GP_PORT_RD_SIM_RX*4);
dev->port_sim.iotype = UPIO_MEM;
//dev->port_sim.irq = -1;
dev->port_sim.ops = &xtrx_uart_ops;
dev->port_sim.flags = UPF_BOOT_AUTOCONF;
dev->port_sim.dev = &dev->pdev->dev;
dev->port_sim.fifosize = 32;
dev->port_sim.uartclk = 9600*16;
dev->port_sim.line = xtrx_no * XTRX_UART_NUM + XTRX_UART_LINE_SIM;
ret = uart_add_one_port(&xtrx_uart_driver, &dev->port_sim);
if (ret) {
uart_remove_one_port(&xtrx_uart_driver, &dev->port_gps);
printk(KERN_NOTICE PFX "Unable to initialize UART SIM port: %d\n", ret);
return ret;
}
dev->sim_ctrl_state = 0;
return 0;
}
static void xtrx_uart_deinit(struct xtrx_dev* dev)
{
uart_remove_one_port(&xtrx_uart_driver, &dev->port_gps);
uart_remove_one_port(&xtrx_uart_driver, &dev->port_sim);
}
// DMA functions
static void xtrx_set_dma_bufs(struct xtrx_dev *d, struct xtrx_dmabuf_nfo *pbufs, unsigned config_off, unsigned len)
{
int i;
unsigned len_qw = len / 16;
//Initialize DMA buffers
for (i = 0; i < BUFS; i++) {
uintptr_t addr = ((uintptr_t)d->bar0_addr) + config_off + 4 * i;
uint32_t reg = ((len_qw - 1) & 0xFFF) | (0xFFFFF000 & pbufs[i].phys);
printk(KERN_NOTICE PFX "buf[%d]=%lx [virt %p] => %08x\n", i, (unsigned long)pbufs[i].phys, pbufs[i].virt, reg);
iowrite32(cpu_to_be32(reg), (void __iomem *)(addr));
memset(pbufs[i].virt, i+1, len);
}
}
static void xtrx_update_rxdma_len(struct xtrx_dev *d, struct xtrx_dmabuf_nfo *pbufs, unsigned len)
{
if ((GET_HWID_COMPAT(d->hwid) >= 1)) {
uint32_t pktsz = (unsigned)((len / 16) - 1) | (1U << 31);
xtrx_writel(d, UL_RXDMA_ADDR + 32, pktsz);
} else {
xtrx_set_dma_bufs(d, pbufs, 0x800, len);
}
}
static int xtrx_allocdma(struct xtrx_dev *d, struct xtrx_dmabuf_nfo *pbufs, unsigned config_off, unsigned buflen)
{
int i;
for (i = 0; i < BUFS; i++) {
#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 18, 0)
pbufs[i].virt = pci_alloc_consistent(d->pdev, buflen, &pbufs[i].phys);
#else
pbufs[i].virt = dmam_alloc_coherent(&d->pdev->dev, buflen, &pbufs[i].phys, GFP_KERNEL);
#endif
if (!pbufs[i].virt) {
printk(KERN_INFO PFX "Failed to allocate %d DMA buffer", i);
for (; i >= 0; --i) {
#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 18, 0)
pci_free_consistent(d->pdev, buflen, pbufs[i].virt, pbufs[i].phys);
#else
dma_free_coherent(&d->pdev->dev, buflen, pbufs[i].virt, pbufs[i].phys);
#endif
}
return -1;
}
}
xtrx_set_dma_bufs(d, pbufs, config_off, buflen);
return 0;
}
static int xtrx_allocdma_tx(struct xtrx_dev *d, unsigned size)
{
int res = xtrx_allocdma(d, d->buf_tx, 0xC00, size);
if (res) {
d->buf_tx_size = 0;
return res;
}
d->buf_tx_size = size;
return 0;
}
static int xtrx_allocdma_rx(struct xtrx_dev *d, unsigned size)
{
int res = xtrx_allocdma(d, d->buf_rx, 0x800, size);
if (res) {
d->buf_rx_size = 0;
return res;
}
xtrx_update_rxdma_len(d, d->buf_rx, size);
d->buf_rx_size = size;
return 0;
}
static void xtrx_freedma_rx(struct xtrx_dev *d)
{
int i;
for (i = 0; i < BUFS; i++) {
#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 18, 0)
pci_free_consistent(d->pdev, d->buf_rx_size, d->buf_rx[i].virt, d->buf_rx[i].phys);
#else
dma_free_coherent(&d->pdev->dev, d->buf_rx_size, d->buf_rx[i].virt, d->buf_rx[i].phys);
#endif
}
d->buf_rx_size = 0;
}
static void xtrx_freedma_tx(struct xtrx_dev *d)
{
int i;
for (i = 0; i < BUFS; i++) {
#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 18, 0)
pci_free_consistent(d->pdev, d->buf_tx_size, d->buf_tx[i].virt, d->buf_tx[i].phys);
#else
dma_free_coherent(&d->pdev->dev, d->buf_tx_size, d->buf_tx[i].virt, d->buf_tx[i].phys);
#endif
}
d->buf_tx_size = 0;
}
// Interrupt routine functions
static void xtrx_interrupt_gpspps(struct xtrx_dev *xtrxdev)
{
struct pps_event_time ts;
pps_get_ts(&ts);
pps_event(xtrxdev->pps, &ts, PPS_CAPTUREASSERT, NULL);
}
static void xtrx_process_l_interrupts(struct xtrx_dev *xtrxdev, uint32_t imask)
{
if (imask & (1 << INT_RFIC0_SPI)) {
atomic_inc((atomic_t*)xtrxdev->shared_mmap + XTRX_KERN_MMAP_CTRL_IRQS);
wake_up_interruptible(&xtrxdev->queue_ctrl);
}
if (imask & (1 << INT_I2C)) {
atomic_inc((atomic_t*)xtrxdev->shared_mmap + XTRX_KERN_MMAP_I2C_IRQS);
wake_up_interruptible(&xtrxdev->queue_i2c);
}
if (imask & (1 << INT_GPS_UART_RX)) {
// TODO tty or user notificatio
//atomic_inc((atomic_t*)xtrxdev->shared_mmap + XTRX_KERN_MMAP_GPS_RX_IRQS);
//wake_up_interruptible(&xtrxdev->uart_gps_rx);
spin_lock(&xtrxdev->port_gps.lock);
if (xtrxdev->gps_ctrl_state) {
unsigned tx_fifo_used;
xtrx_uart_do_rx(&xtrxdev->port_gps, &tx_fifo_used);
xtrx_uart_do_tx(&xtrxdev->port_gps, tx_fifo_used);
}
spin_unlock(&xtrxdev->port_gps.lock);
}
if (imask & (1 << INT_SIM_UART_RX)) {
// TODO tty or user notificatio
//atomic_inc((atomic_t*)xtrxdev->shared_mmap + XTRX_KERN_MMAP_SIM_RX_IRQS);
//wake_up_interruptible(&xtrxdev->uart_gps_rx);
spin_lock(&xtrxdev->port_sim.lock);
if (xtrxdev->sim_ctrl_state & WR_SIM_CTRL_ENABLE) {
unsigned tx_fifo_used;
xtrx_uart_do_rx(&xtrxdev->port_sim, &tx_fifo_used);
xtrx_uart_do_tx(&xtrxdev->port_sim, tx_fifo_used);
}
spin_unlock(&xtrxdev->port_sim.lock);
}
}
static irqreturn_t xtrx_msi_irq_pps(int irq, void *data)
{
struct xtrx_dev *xtrxdev = data;
xtrx_interrupt_gpspps(xtrxdev);
atomic_inc((atomic_t*)xtrxdev->shared_mmap + XTRX_KERN_MMAP_1PPS_IRQS);
wake_up_interruptible(&xtrxdev->onepps_ctrl);
return IRQ_HANDLED;
}
static irqreturn_t xtrx_msi_irq_tx(int irq, void *data)
{
struct xtrx_dev *xtrxdev = data;
atomic_inc((atomic_t*)xtrxdev->shared_mmap + XTRX_KERN_MMAP_TX_IRQS);
wake_up_interruptible(&xtrxdev->queue_tx);
return IRQ_HANDLED;
}
static irqreturn_t xtrx_msi_irq_rx(int irq, void *data)
{
struct xtrx_dev *xtrxdev = data;
atomic_inc((atomic_t*)xtrxdev->shared_mmap + XTRX_KERN_MMAP_RX_IRQS);
wake_up_interruptible(&xtrxdev->queue_rx);
return IRQ_HANDLED;
}
static irqreturn_t xtrx_msi_irq_other(int irq, void *data)
{
struct xtrx_dev *xtrxdev = data;
uint32_t imask;
imask = xtrx_readl(xtrxdev, GP_PORT_RD_INTERRUPTS);
xtrx_process_l_interrupts(xtrxdev, imask);
return IRQ_HANDLED;
}
static irqreturn_t xtrx_irq_legacy(int irq, void *data)
{
struct xtrx_dev *xtrxdev = data;
uint32_t imask = xtrx_readl(xtrxdev, GP_PORT_RD_INTERRUPTS);
if (imask == 0) {
return IRQ_NONE;
}
if (imask & (1 << (INT_1PPS))) {
xtrx_msi_irq_pps(irq, data);
}
if (imask & (1 << (INT_DMA_TX))) {
xtrx_msi_irq_tx(irq, data);
}
if (imask & (1 << (INT_DMA_RX))) {
xtrx_msi_irq_rx(irq, data);
}
xtrx_process_l_interrupts(xtrxdev, imask);
return IRQ_HANDLED;
}
static irqreturn_t xtrx_msi_irq_single(int irq, void *data)
{
xtrx_irq_legacy(irq, data);
return IRQ_HANDLED;
}
static struct pps_source_info xtrx_pps_info = {
.name = "xtrx_pps",
.path = "",
.mode = PPS_CAPTUREASSERT|PPS_OFFSETASSERT|PPS_ECHOASSERT|
PPS_CANWAIT|PPS_TSFMT_TSPEC,
.owner = THIS_MODULE,
};
static int xtrxfd_open(struct inode *inode, struct file *filp)
{
struct xtrx_dev *dev;
unsigned long flags;
int granted = 0;
dev = container_of(inode->i_cdev, struct xtrx_dev, cdev);
filp->private_data = dev;
spin_lock_irqsave(&dev->slock, flags);
if ((dev->locked_msk & XTRX_BLK_CHAR_DEV) == 0) {
dev->locked_msk |= XTRX_BLK_CHAR_DEV;
granted = 1;
}
spin_unlock_irqrestore(&dev->slock, flags);
return (granted) ? 0 : -EBUSY;
}
static int xtrxfd_release(struct inode *inode, struct file *filp)
{
struct xtrx_dev *xtrxdev = filp->private_data;
unsigned long flags;
if (xtrxdev->valid == 0) {
printk(KERN_INFO PFX "XTRX:%d dev is invalid!\n", xtrxdev->devno);
return 0;
}
xtrx_power_op(xtrxdev, 0, XTRX_BLK_CHAR_DEV);
spin_lock_irqsave(&xtrxdev->slock, flags);
xtrxdev->locked_msk &= ~XTRX_BLK_CHAR_DEV;
spin_unlock_irqrestore(&xtrxdev->slock, flags);
return 0;
}
static ssize_t xtrxfd_read(struct file *filp, char __user *buf, size_t count,
loff_t *f_pos)
{
struct xtrx_dev *xtrxdev = filp->private_data;
int i;
int timeout = 2 * HZ;
if (!xtrxdev)
return -ENODEV;
if (!f_pos)
return -EINVAL;
if (count > 1) {
timeout = HZ * count / 1000;
if (timeout < 1)
timeout = 1;
}
switch (*f_pos) {
case XTRX_KERN_MMAP_1PPS_IRQS:
i = wait_event_interruptible_timeout(
xtrxdev->onepps_ctrl,
atomic_read(((atomic_t*)xtrxdev->shared_mmap) + XTRX_KERN_MMAP_1PPS_IRQS) != 0,
2 * HZ);
if (!i) {
return -EAGAIN;
}
return atomic_xchg(((atomic_t*)xtrxdev->shared_mmap) + XTRX_KERN_MMAP_1PPS_IRQS, 0);
case XTRX_KERN_MMAP_CTRL_IRQS:
i = wait_event_interruptible_timeout(
xtrxdev->queue_ctrl,
atomic_read(((atomic_t*)xtrxdev->shared_mmap) + XTRX_KERN_MMAP_CTRL_IRQS) != 0,
2 * HZ);
if (!i) {
return -EAGAIN;
}
return atomic_xchg(((atomic_t*)xtrxdev->shared_mmap) + XTRX_KERN_MMAP_CTRL_IRQS, 0);
case XTRX_KERN_MMAP_I2C_IRQS:
i = wait_event_interruptible_timeout(
xtrxdev->queue_i2c,
atomic_read(((atomic_t*)xtrxdev->shared_mmap) + XTRX_KERN_MMAP_I2C_IRQS) != 0,
2 * HZ);
if (!i) {
return -EAGAIN;
}
return atomic_xchg(((atomic_t*)xtrxdev->shared_mmap) + XTRX_KERN_MMAP_I2C_IRQS, 0);
case XTRX_KERN_MMAP_RX_IRQS:
i = wait_event_interruptible_timeout(
xtrxdev->queue_rx,
atomic_read(((atomic_t*)xtrxdev->shared_mmap) + XTRX_KERN_MMAP_RX_IRQS) != 0,
timeout/*2 * HZ*/);
if (!i) {
return -EAGAIN;
}
return atomic_xchg(((atomic_t*)xtrxdev->shared_mmap) + XTRX_KERN_MMAP_RX_IRQS, 0);
case XTRX_KERN_MMAP_TX_IRQS:
i = wait_event_interruptible_timeout(
xtrxdev->queue_tx,
atomic_read(((atomic_t*)xtrxdev->shared_mmap) + XTRX_KERN_MMAP_TX_IRQS) != 0,
timeout/*2 * HZ*/);
if (!i) {
return -EAGAIN;
}
return atomic_xchg(((atomic_t*)xtrxdev->shared_mmap) + XTRX_KERN_MMAP_TX_IRQS, 0);
}
return -EINVAL;
}
static ssize_t xtrxfd_write(struct file *filp, const char __user *buf, size_t count,
loff_t *f_pos)
{
return -EINVAL;
}
static unsigned int xtrxfd_poll(struct file *filp, poll_table *wait)
{
struct xtrx_dev *xtrxdev = filp->private_data;
unsigned int mask = 0;
poll_wait(filp, &xtrxdev->queue_ctrl, wait);
poll_wait(filp, &xtrxdev->queue_tx, wait);
poll_wait(filp, &xtrxdev->queue_rx, wait);
if (atomic_read(((atomic_t*)xtrxdev->shared_mmap) + XTRX_KERN_MMAP_CTRL_IRQS))
mask |= POLLIN | POLLRDNORM;
if (atomic_read(((atomic_t*)xtrxdev->shared_mmap) + XTRX_KERN_MMAP_RX_IRQS))
mask |= POLLIN | POLLRDBAND;
if (atomic_read(((atomic_t*)xtrxdev->shared_mmap) + XTRX_KERN_MMAP_TX_IRQS))
mask |= POLLOUT | POLLWRBAND;
return mask;
}
// TODO more ioctls
// FIXME fix ioctl numbers